Human IL-1ra/IL-1F3 Antibody

Catalog #: AB-280-NA Datasheet / COA / SDS
Catalog # Availability Size / Price Qty
IL‑1ra/IL‑1F3 Inhibition of IL‑1 alpha /IL‑1F1-dependent Cell Proliferation and Neutral-ization by Human IL‑1ra/IL‑1F3 Antibody.
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Human IL-1ra/IL-1F3 Antibody Summary

Species Reactivity
Detects human IL‑1ra/IL-1F3 in direct ELISAs and Western blots. In direct ELISAs, less than 10% cross-reactivity with recombinant mouse IL‑1ra/IL‑1F3, recombinant rat IL-1ra/IL-1F3, recombinant porcine IL‑1ra/IL-1F3, and recombinant equine IL‑1ra/IL-1F3 is observed, and less than 1% cross-reactivity with recombinant human (rh) IL-1a, rhIL-1b, rhIL-18, and rhIL-1H1 is observed.
Polyclonal Goat IgG
Protein A or G purified
E. coli-derived recombinant human IL‑1ra/IL-1F3
Accession # P18510
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
Endotoxin Level
<0.10 EU per 1 μg of the antibody by the LAL method.


Recommended Concentration
Western Blot
1 µg/mL
Recombinant Human IL‑1ra/IL‑1F3 (Catalog # 280-RA)
Measured by its ability to neutralize IL‑1ra/IL‑1F3 inhibition of IL‑1 alpha /IL‑1F1-dependent proliferation in the D10.G4.1 mouse helper T cell line [Symons, J.A. et al. (1987) in Lymphokines and Interferons, a Practical Approach. Clemens, M.J. et al. (eds): IRL Press. 272]. The Neutralization Dose (ND50) is typically 5-10 µg/mL in the presence of 50 ng/mL Recombinant Human IL‑1ra/IL‑1F3, 50 pg/mL Recombinant Human IL‑1 alpha /IL‑1F1.

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Scientific Data

Neutralization IL‑1ra/IL‑1F3 Inhibition of IL‑1 alpha /IL‑1F1-dependent Cell Proliferation and Neutral-ization by Human IL‑1ra/IL‑1F3 Antibody. View Larger

IL‑1ra/IL‑1F3 Inhibition of IL‑1 alpha /IL‑1F1-dependent Cell Proliferation and Neutral-ization by Human IL‑1ra/IL‑1F3 Antibody. Recombinant Human IL-1ra/IL-1F3 (Catalog # 280-RA) inhibits Recombinant Human IL-1a/IL-1F1 (Catalog # 200-LA) induced proliferation in the D10.G4.1 mouse helper T cell line in a dose-dependent manner (orange line). Inhibition of Recombinant Human IL-1a/IL-1F1 (50 pg/mL) activity elicited by Recombinant Human IL-1ra/IL-1F3 (50 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human IL-1ra/IL-1F3 Polyclonal Antibody (Catalog # AB-280-NA). The ND50 is typically 5-10 µg/mL.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Preparation and Storage

Reconstitute at 1 mg/mL in sterile PBS.
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: IL-1ra/IL-1F3

IL-1ra was originally isolated from the urine of patients with monocytic leukemia and has also been purified from adherent monocytes. The naturally occurring, fully glycosylated form has an apparent molecular weight of about 25,000 Daltons. The protein shows 26% amino acid homology to IL-1 beta and 19% homology to IL-1 alpha. It will compete with either factor for receptor binding, but does not interact with either one. Human IL-1ra will bind to both types of IL-1 receptor (I and II) on human cells, but reportedly will not block binding to the type II receptor on murine pre-B cell lines. The recombinant, non-glycosylated form of IL-1ra blocks binding of IL-1 to its receptor equally as well as the naturally-occurring, glycosylated form. The IL-1ra has been shown to block the inflammatory responses induced by IL-1 both in vitro and in vivo. Currently, pre-clinical and clinical studies are underway to test possible therapeutic applications for IL-1ra in the treatment of sepsis, rheumatoid arthritis and chronic myelogenous leukemia.

Long Name
Interleukin 1 Receptor Antagonist
Entrez Gene IDs
3557 (Human); 16181 (Mouse); 60582 (Rat); 397499 (Porcine)
Alternate Names
DIRA; ICIL-1ra; IL1F3; IL-1F3; IL1ra; IL-1ra; IL-1ra3; IL1RN; IL-1RN; interleukin 1 receptor antagonist; IRAP; MVCD4

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